Laminating an aileron spar

"I am concerned about two things; because pine (for example) has a different
density than spruce, they might react differently to humidity or temp change
and affect the straightness of the spar."

I do not think the difference in density will be the problem. A thin piece
of dried wood, when attached to a larger piece of wood will continue to
adapt to the shape of the larger piece of wood. The larger spruce would not
be any more likely to warp - but for the fact that one side is now protected
from the moisture - and that would occur no matter what kind of wood you
use.

The completed piece should be no more likely to warp than the original
piece.

As to the second part of the concern - about the inspection - ask the
inspector in advance. Remember, it is experimental.

Colin

COLIN LAMB wrote:
"I am concerned about two things; because pine (for example) has a different
density than spruce, they might react differently to humidity or temp change
and affect the straightness of the spar."

I do not think the difference in density will be the problem. A thin piece
of dried wood, when attached to a larger piece of wood will continue to
adapt to the shape of the larger piece of wood. The larger spruce would not
be any more likely to warp - but for the fact that one side is now protected
from the moisture - and that would occur no matter what kind of wood you
use.

The completed piece should be no more likely to warp than the original
piece.

As to the second part of the concern - about the inspection - ask the
inspector in advance. Remember, it is experimental.

Colin

COLIN LAMB wrote:
Remember, it is experimental.

Colin

Nope: certified

On 27 Mar 2007 07:36:25 -0700, "mhorowit" wrote:


COLIN LAMB wrote:
Remember, it is experimental.

Colin

Nope: certified


My A&P wants spruce or fir, so fir it will be
Thanks to all - MIke

"Michael Horowitz" wrote in message
...
On 27 Mar 2007 07:36:25 -0700, "mhorowit" wrote:


COLIN LAMB wrote:
Remember, it is experimental.

Colin

Nope: certified


My A&P wants spruce or fir, so fir it will be
Thanks to all - MIke

When they were building Taylorcrafts in Alliance and wherever else
they built them, the wood for the ailerons was kinda like leftovers.

I just looked at a couple of original laminated aileron spars from the
1940's. The laminations were along their height, not their thickness.

It's amazing that after all these years the Taylorcraft spars, all
Sitka spruce so far as I know, don't have any AD's. Neither do their
struts. Matter of fact Taylorcrafts have very few AD's. My A&P, C.
M. Owenby, who is now sacred to the memories in these parts, always
said the Taylorcrafts were built like trucks. And yet they were light
and capable of carrying wondrous loads.

On Tue, 27 Mar 2007 19:27:50 -0500, " jls"
wrote:


"Michael Horowitz" wrote in message
.. .
On 27 Mar 2007 07:36:25 -0700, "mhorowit" wrote:


COLIN LAMB wrote:
Remember, it is experimental.

Colin

Nope: certified


My A&P wants spruce or fir, so fir it will be
Thanks to all - MIke

When they were building Taylorcrafts in Alliance and wherever else
they built them, the wood for the ailerons was kinda like leftovers.

I just looked at a couple of original laminated aileron spars from the
1940's. The laminations were along their height, not their thickness.

It's amazing that after all these years the Taylorcraft spars, all
Sitka spruce so far as I know, don't have any AD's. Neither do their
struts. Matter of fact Taylorcrafts have very few AD's. My A&P, C.
M. Owenby, who is now sacred to the memories in these parts, always
said the Taylorcrafts were built like trucks. And yet they were light
and capable of carrying wondrous loads.


I am constantly impressed by what I am seeing and learning as I go
thru this experience - Mike

jls wrote:
"Michael Horowitz" wrote in message
...

On 27 Mar 2007 07:36:25 -0700, "mhorowit" wrote:


COLIN LAMB wrote:
Remember, it is experimental.

Colin

Nope: certified


My A&P wants spruce or fir, so fir it will be
Thanks to all - MIke


When they were building Taylorcrafts in Alliance and wherever else
they built them, the wood for the ailerons was kinda like leftovers.

I just looked at a couple of original laminated aileron spars from the
1940's. The laminations were along their height, not their thickness.

It's amazing that after all these years the Taylorcraft spars, all
Sitka spruce so far as I know, don't have any AD's. Neither do their
struts. Matter of fact Taylorcrafts have very few AD's. My A&P, C.
M. Owenby, who is now sacred to the memories in these parts, always
said the Taylorcrafts were built like trucks. And yet they were light
and capable of carrying wondrous loads.



I (heart) T-Carts!